///\todo upgrade

//////////////////////////////////////////////////////////////////////////////////
//                                                                              //
//  This file is part of the buola project (https://code.google.com/p/buola/).  //
//                                                                              //
//  Copyright(c) 2007-2012 Xavi Gratal                                          //
//  gratal AT gmail DOT com                                                     //
//                                                                              //
//  Buola is free software: you can redistribute it and/or modify               //
//  it under the terms of the GNU General Public License as published by        //
//  the Free Software Foundation, either version 3 of the License, or           //
//  (at your option) any later version.                                         //
//                                                                              //
//  Buola is distributed in the hope that it will be useful,                    //
//  but WITHOUT ANY WARRANTY; without even the implied warranty of              //
//  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the               //
//  GNU General Public License for more details.                                //
//                                                                              //
//  You should have received a copy of the GNU General Public License           //
//  along with buola.  If not, see <http://www.gnu.org/licenses/>.              //
//                                                                              //
//////////////////////////////////////////////////////////////////////////////////

#ifndef _BUOLA_IMAGE_CLINESEGMENT_H_
#define _BUOLA_IMAGE_CLINESEGMENT_H_

#include <buola/utility/cfixed.h>

namespace buola { namespace img {

class CLineSegment
{
public:
    CLineSegment()
    {}

    CLineSegment(const CPoint_x &p1,const CPoint_x &p2)
        :   m1(p1)
        ,   m2(p2)
        ,   mTop(std::min(p1.y,p2.y))
        ,   mBottom(std::max(p1.y,p2.y))
    {}

    CFixed<> GetXForY(const CFixed<> &pY) const
    {
        if(pY==m1.y)
            return m1.x;
        if(pY==m2.y)
            return m2.x;

        CFixed<> lDY=m2.y-m1.y;

        if(!lDY) return m1.x;

        return m1.x+(pY-m1.y)*(m2.x-m1.x)/lDY;
    }

    bool operator==(const CLineSegment &pRH) const
    {
        return m1==pRH.m1&&m2==pRH.m2;
    }

    bool operator!=(const CLineSegment &pRH) const
    {
        return m1!=pRH.m1||m2!=pRH.m2;
    }

    ///we assume that \p pP lies within the line, but possibly outside of the segment
    bool ContainsIntersection(const CPoint_x &pP) const
    {
        ///\todo account for inaccuracies
        return pP.y>=mTop&&pP.y<=mBottom;
    }

    CPoint_x m1,m2;
    CFixed<> mTop,mBottom;
};

/*namespace img*/ } /*namespace buola*/ }

#endif
